The best part about this "sequel" to Abbott and Costello's classic "Who's on First" routine starring Jimmy Fallon, Billy Crystal, Jerry Seinfeld, and A.D. Miles, is how great it is.

The worst part about the "sequel" to Abbott and Costello's classic "Who's on First" routine starring Jimmy Fallon, Billy Crystal, Jerry Seinfeld, and A.D. Miles is how many people probably don't know it's a sequel.